Metallic structure



Re. l 6,482

Nov. 23 1926.

yl.. s. I AcHMAN METALLIC STRUCTURE INVENToR Original Filed May 8, 1916 2 Sheets-Sheet 1 Il fr N Novlzs s s. LACHMAN METALLIC STRUCTURE 2 sheets-sheet 2 original Filed May a, 1916 INVENTOR Reissued Nov. 23, 1926. U N l T E D S LAURENCE S.' LACHMAN,

Original N-o. 1,300,740, dated April 15,1919, Serial No.

filed August 3l, 1926.

his invention relates to structures for use as girders,

OF FOREST HILL MENTS, T0 BETHLEHEM STEEL COMPANY, A

TATES S, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- CORPORATION 0F YENNSYLVANIA.

METALLIC STRUCTURE.

metallic truss frames or other purposes for which the structures may be employed.

The objectof the vinvention is to provide a strong, simple structure talhc members cheaply assembled and jine The invention consists essentially of intersectingy mewhich can be quickly and d together.

of a metallic truss in which a zig-zag middle member is electrically bends to oppositelv dispose-d,

by means of edge to edge or contact.

welded at, or near, its

flanged chords edge to surface In the. accompanying drawing illustrating embodiments of my invention,

front elevation invention.

Fig. 2 is an end elevation Fig. f3 is a invention.

Fig. 4 1s an Figure 1 1s a of a structure or frame constructed 1n accordance with one formcf this y of the same.

another end elevation of the same.

Fig. 5 is a plan view or transverse section through a pole or column constructed by using the frame illustrated in Fig. 3 as side members.

Fig. 6 is aside elevation on a reduced scale of the column illustrated in Fig. 7 is a illustrating a vention and section through the same.

Referring particularly the drawings, 1 indicates a Fis. 5.

front elevation of a structure further embodiment of the in- Fig. 8 is a transverse vertical to Figs. 1 and 2 of zigzag metallic member preferably formed continuous from end to end and of any metal strip from formed being bent that adjoining legs angle with each other.

The said member 1 of longitudinal each pair engaging opposit middle nember 1 near the of the zigzag arrangement. dinal bars 2-2, shaped in cross-section and tact with the edges of 'desired width, the which the member is at the desired places so will form any desired is held between pairs members 2-2 and 3-3 e edges of the corners or turns The longitu- 3-3 areV angle or V- placed in conthe zigzag member 1 by engaging said edges by both free edges along the open side of the whereby each bar intersects member 1 at two places.

V-shaped bars the edge of' the being softened by i 8 in Fig. 5.

Application for reissue In this position the parts are secured together preferably by electrically Welding them at thel pointsof intersection, a weld bemg formed at eac-h of the points 4. Upon the electric heating, and upon pressure being applied, the metal of the contacting portions more or less interpene'trate. The penetrating action of the edges of the V bends is particularly efective, as they act like wedges to enter1 the metal of the middle member. This type of Welding -is very resistant against shear and other stresses. Then too, in this form ofthe invention each bar makes four welds in the vicinity of each bend.

Referring to Figs. 3, 4, 5 and 6, the longitudinal bars 5, 6 contact with the corners or turns of' the zigzagV member 1 and are welded thereto at such points of intersection. In this case the longitudinal bars which are preferably V-shaped straddle the corners or turns of the zigzag members, the edges of the members contacting with the surface or edge of the V bars. At these contact-ing points indicated at T the parts are electrically weldedvtogether, two Welds being formed at each corner or turn with each bar. In this embodiment the wedge like action during the welding operation, to effect penetration of one member by another, is furnished by the ed ges of the middle member. A column or pole may be readily constructed of members vformed as shown in Figs. 3 and 4 by arran ing the-structure upright as illustrated in ig. 6 and bring ing the face of one of the flanges of the V- shaped bar into flat contact with a flange of the bar of another unit as indicated at The meeting flanges of the bars 5 and 6 may then be secure-d together in any desired manner along .the meeting surfaces, as by rivets or bolts 9 in the spaces between the legs of the members 1 or by spot welding the bars at such places or otherwise.

Referring to the form illustrated in Figs. 7 and 8, the V-shaped longitudinal bars 5 and`6 engage' the corners or turns of the zigzag member 1 by their apexes so that but one point of contact is made between the bars and each turn or corner. At the contacting points the members are electrically welded to each other, the apex of the V bars sinking into the metal at the turn of the out along the ksides vof the V bars as indicated more clearly at 10 in-Fig. 8.

In each ofthe embodiments of the invention, which have been described, there is a zigzagmiddle member, electrically Welded at, or near, its bends to flanged and longitudinal members. The flanged character of the chord members is especially-important. Not only does it`furnishl strength to the structure because 0f the strength inherent in a flanged element, butnbecause of it the members are adapted to cooperate'to furnish an edge to edge or an edge to surface contion of one member by-another during the Welding operation.

\ What I claim as my invention is:

1. A metallic structure comprising a zigedges of the middle tact, each involving a Wedge like penetra'- zag middle member and a pair of Hanged longitudinal members spaced apart by said middle member with the flanges thereof engaging and intersecting the edges of the middle member and .Welded thereto.

2; A metal structure comprising a zigzag middle member and a pair of V-shaped 1ongitudinal bars spaced apart by said middle member with the free edges intersecting the member near the turns thereof, said bars being-Welded to the middle member at the` intersect-ing points, thereby forming four Welds between eachubar and the middle member. A

y In testimony whereof I hereuntov aix my signature.

LAURENCE s LACHMAN 

